Answer: It is the reward for lending money.
A bond is:
👉 Lending
Interest is:
👉 Compensation
The borrower pays for using money.
■ Essence
Interest is the price of lending capital.
How Is Bond Interest Calculated?
Answer: By principal × interest rate.
Example:
👉 Principal: 1,000,000 yen
👉 Rate: 2%
Calculation:
👉 1,000,000 × 2% = 20,000 yen
Paid annually.
■ Essence
Interest is proportional to the amount and rate.
What Is Maturity?
Answer: It is the date when the principal is returned.
Structure:
👉 Interest → during the period
👉 Principal → at the end
Time defines the contract.
■ Essence
Maturity completes the lending cycle.
When Is Interest Paid?
Answer: Usually once or twice a year.
Common patterns:
👉 Annual
👉 Semiannual
Each payment:
👉 Income to investor
■ Essence
Interest provides periodic income.
Why Do Bond Prices Change?
Answer: Because of interest rate changes.
If market rates rise:
👉 New bonds → higher interest
👉 Old bonds → less attractive
👉 Price → falls
■ Essence
Bond prices adjust to new interest environments.
What Happens When Interest Rates Fall?
Answer: Existing bonds become more valuable.
If market rates fall:
👉 Old bonds → relatively high interest
👉 Demand increases
👉 Price rises
■ Essence
Lower rates increase the value of existing bonds.
What Types of Bond Interest Exist?
Answer: Fixed and floating.
👉 Fixed-rate
Interest does not change
👉 Floating-rate
Interest adjusts with market
Structure defines behavior.
■ Essence
Interest type determines stability vs flexibility.
● Conclusion
Answer: Bonds generate income through interest.
Key points:
👉 Lending → interest income
👉 Time → maturity
👉 Rates → price movement
■ Essence
Bond investing is a system of earning stable income through lending.
👉 In essence, interest is not just income—it is the fundamental mechanism that connects time, risk, and money in bond investing.